Bluepill + W5500 Ethernet Webserver using PlatformIO

Description

This project uses a “W5500 lite” board (also called DEVMO USR-ES1) connected to a standard BluePill board (STM32F103C8).

The code is a slight extension of the original WebServer.ino (https://github.com/arduino-libraries/Ethernet/blob/master/examples/WebServer/WebServer.ino) sketch with the addition of reading out the supply voltage of the board.

No changes to the Ethernet library have bene made.

Wireup

Refer module datasheet for details.

Power pins: All GNDs to Bluepill’s GNDs, all VIN3.3 pins to Bluepill’s 3.3V
- since the module is power-hungry, extra decoupling capacitors on the 3.3V rail are recommended
SPI: use default SPI1 (SCK = PA5, MISO = PA6, MOSI = PA7) and arbitrary chip select (here CS = PA4)
nRESET of W5500 module must be tied to 3.3V, otherwise the chip won’t start
INT and POWERDOWN are not used

Expected output

The Serial UART output is on PA9 at 115200 baud.

The sketch should start with detecting the W5500 chip and getting an IP address via DHCP. If its HTTP website (port 80) is visited, the request is printed and some data is sent back.

Ethernet WebServer Example
W5500 detected
server is at 192.168.1.237
new client
GET / HTTP/1.1
Host: 192.168.1.237
User-Agent: Mozilla/5.0 (Windows NT 10.0; Win64; x64; rv:74.0) Gecko/20100101 Firefox/74.0
Accept: text/html,application/xhtml+xml,application/xml;q=0.9,image/webp,*/*;q=0.8
Accept-Language: de,en-US;q=0.7,en;q=0.3
Accept-Encoding: gzip, deflate
Connection: keep-alive
Upgrade-Insecure-Requests: 1
Cache-Control: max-age=0

client disconnected